color replacement

Ok, Pierre, two more minutes.
I did not understand that I should whiten everything, so I tried to match the adjacent colour (Maybe it’s a language problem). Haven't whiten that colour yet, so you can see what I mean.

Decrease Sat and increase Lightness in Hue/Sat, AL layer.
Select the rest and use the same technique.
The adjustment is subjective, but the technique are still fast and precise.

1) Create a desat adj layer
2) Copy G channel and set black point to the red area of the shirt... invert so black is now white(this is your selection
3) paint in the desat adj layer with this new selection
4) Group a curve in SCREEN mode over the desat layer and you're done
5) for the anal... use a hue/sat layer to address the red cast on the lower left section of the image... no red, so no cast

I think this is about as close as we are going to get to white without a huge amount of mucking about, given the collar etc. I made two channel masks, one of the red area of the shirt and the other of the lower band of the shirt and then combined them into a single mask. After adjusting the colours down to as approximate as possible, I then returned to the mask of the red areas and reduced it further to blend with the lower shirt and collar. And yes, red does bleed both in photoshop and in the wash

This is brilliant, Cass! I took your image, copied and pasted it to itself at "soft light" and that brought out the wee boys features perfectly.

The problem with a color change like this is that for the three different areas of the shirt you have three different highlight/shadow ranges.

I first selected the entire shirt (collar too: it's not white, it's red), applied a hue/saturation adjustment layer, pulling the saturation all the way to the left. That eliminated any color issues.

Two other channel masks allowed me to target the red and grey areas of the shirt with curves that lightened both highlights and shadows to an acceptable range for white and that brought them both into a common range.

Anti-aliased masks being what they are, a seam remained between the two areas. Merge visible to a new layer allowed me to deal with that seam using the healing brush, and also to extend the shape of the material folds upward in a more natural manner.

A final curve, using the original shirt mask boosted contrast slightly, bringing out detail over the entire shirt.

I think it is really hard to change dark colors into white, but this case I d like to do it in LAB mode, so I can handle lightness and color seperately, make selections, use levels to match the lightness. and desatured the colors. use stamp and patch tool to remove the unnatual areas.